/Engine/Plugins/Runtime/GeometryProcessing/Source/DynamicMesh/Public/MeshSimplification.h
Return point that minimizes quadric error for edge [ea,eb]
FVector3d OptimalPoint ( int eid, const [FQuadricErrorType](API\Plugins\DynamicMesh\TMeshSimplification\FQuadricErrorType) & q, int ea, int eb )